Bevel recessing reamer



March 6, 1951 M, CLARK 2,544,444

BEVEL RECESSING REAMER Filed April '11, 1947 IN VEN TOR. [cu/5 M (Zap/rATTOR/VE Y Patented Mar. 6, 1951 UNITED STATES PTENT OFFICE BEVELRECESSING REAMER Louis M. Clark, Fort Collins, C010.

7 ApplicationApril .1 1, 1947,,Serial No. 740,892

This" invention relates bevel recessing reamers.

In'the manufacture of furniture and in wood "working manufacturegenerally, it is frequently necessary to' provide an article such as a'chair with-braces or bars and these are usually made turning down an endportion to a predeterjinined size, inserting this into a hole of thesame size and securing the two parts together with a liberal quantity ofglue.

As an example of an article that is frequently constructed in thismanner, reference is made to the ordinary dining room chairs.

It is evident that a much better and more secure joint would be obtainedbetween two members if the hole in one member were inwardly flaring andthe male portion of the other member reduced to a size of the outer endof theopenmg; "split and provided with ,a wedge in such a 'way that whenit is driven into the hole or opening the end will spread and conformtothe sides of theinwardly flaring hole.

It' is the object of this invention to produce a simple and substantialtool that can be usedv either in a drill press, or with an ordinary handoperated brace and which will quickly ream prebored holes so as to givethem an increasing diameter inwardly towardsthe bottom.

Another object of this invention is to produce:

a device of the class mentioned which shall be of a simple constructionand so designed that the cutter blades may be readily removed forsharpening. a

A further object of. the invention is to produce a tool of the typeindicated in which no part of the tool will contact the outer surface ofthe member having the opening that is being reamed.

. -A- further object of the invention is to produce a tool of suchconstruction that all holes reamed thereby will be exactly alike.

A further object of the invention is' to produce a tool with a fewrugged-parts that can be easily assembled and whichcan be held frommoving 'in' response to the torque forces exerted thereon I 2 Claims;(01. 145 114) to: improvements in Figure 2 is a section taken on line2'-2, Figure 1; I

i Figure 3 is an enlarged fragmentary view .taken partly in section online 2--2, Figure 1, and show ing other parts in elevation; "Figure 4 isa section taken on line 4-4, Figure 3;

Figure 5 is a section taken on line 55, Figure 3; and

Figure 6 is a section through a member showing an inwardly flaringopening in which is positioned the expanded end of a brace member.

Referring now to the drawing,v reference numeral l designatestheelongated hollow body of the tool, and reference numeral lldesignates the shank portion thereof, which may be of the proper sizeand shape to fit the means by which it'isrotated. Body I!) is providedwith an axial opening l2 that terminates in ashort section of concentricopening whose wall has been designated by numeral 13. The end opening isof larger diameter than the main opening l2 and the outer end of thewall of the smaller or inner opening has a threaded section l4.Positioned within the open end of the tubular body is a plug l having anaxial opening l6 and longitudinally extending grooves I! in its outersurface. In the drawing four such grooves have been shown. A smaller orlarger number may be used, if desired. Plug l5 has a threaded section ofthe proper size to operatively engage the threads in the inner surfaceof tubular body In and an outer. cylindrical section of greater diameterthan the threaded section. The outer enlarged end ,"of the plug isprovided with transverse notches I8 at the inner ends of grooves l1.Wall l3 surrounds the outer grooved end of the plug and forms a closurefor the grooves therein. Wall [3 has a threaded opening at each notch I!in which is positioned a screw l9 that serves as an abutment for springl9, that serves to hold cutter blades in thecollapsed position shown inFigures-2 and 3 un'til they are urged outwardly by the spreader ina'manner hereinafter described. Cutter blades 2%! have a shape somewhatlike that shown in Figures 2, 3 and 4 and are 7 positioned in grooves l1as-shown. Set screws 19a prevent the plugifrom rotating (Fig. 5). Thefree ends of the blades are each provided with an inclined surface thatforms a cutting edge 2i The inner ends of the cutter blades are providedwith laterally projecting trunnions 22 that are located in notches l8and prevent the cutting blades from.moving outwardly while permittingthem to spread laterally to a limited extent.

A blade spreading member comprising a cam having an inwardly taperingfrustoconical surface 23 and an axially extending cylindrical portion 24is so positioned that member 24 projects through the opening H in plugl5 and terminates in a threaded end portion 25. A round nut 26 isconnected with the threaded end portion as shown. A helical compressionspring 21 is positioned in opening [2, one end abutting the inner end ofopening 12 and the other end abutting the nut 26. Spring 2'! is undercompression and tends to hold the parts in the position shown in Figure2 in which position the outer surfaces of the cutting blades aresubstantially parallel. The maximum distance between the outer surfacesof diametrically positioned blades is slightly less than the diameter ofthe hole to be reamed. The largest diameter of the cam 23 is less thanthe diameter of the opening to be reamed and therefore the tool may beinserted into the opening with thebase' of part 23 resting on the bottomof the hole to be reamed. The tool is now rotated .in'such a directionthat the side nearest the observer when viewed as in Figure 3, movesdownwardly. This produces a cutting action on the part of the cutterblades, and as these move inwardly into the opening they are spreadapart by the cam action of member 23 with the result that an inwardlyflaring hole like that designated by'referencenumeral 28 in Figure 6results. The length of the spreading cone or cam should be such that thedistance from the cutting edges 21 to the base of the cone portion shallbe equal to the depth of the hole to. be flared. This distance .has beendesignated by the letter (Z in Figure 2.

' After the hole has been reamed and flared to .the'shape shown inFigure 6, the end of bar 29, that is to be inserted therein, is splitdiametrical- .'ly and provided with a wedge 30. When the bar driven intothe opening the wedge will be forced into the end-of the bar spreadingit in the manner .shown in Figure 6. The. two parts will then bepermanently and rigidly interconnected. If desired glue may be used inaddition to the wedge,

in either case it wiil be'practically impossiblev to separate the partsdue to the inwardly flaring interconnecting surfaces.

From the above description it will be seen that .by use of the tooldescribed herein and shown on the drawing, holes bored by ordinaryangers can be readily reamed into a shape in which they are inwardlyflaring with the result that any joint constructed in the mannerdescribed will be permanent.

Having described the invention what is claimed as new is:

.having a diameter greater than the root diameter of the threads, a plughaving a threaded portion engaged in the threaded section, and a portionof greater diameter, said portion of greater diameter having a pluralityof longitudinally extending grooves, cutter blades positioned in thegrooves the grooved portion of the plug being positioned in the enlargedouter end of the body, the wall of which serves to close the grooves andsecure the cutter blades therein, means providing a pivotal connectionbetween the blades and the plug adjacent the inner ends of the notches,whereby the blades are free to spread, the plug having an axial opening,an outwardly flaring spreader cone having an axial rod-like memberextending through the opening in the plug, an enlarged head on the innerend of said rod limiting its outward movement, and a compression springpositioned in the axial opening of the body in abutting relation withthe bottom of the opening and the enlarged head, the force of the springnormally holding the cone in its outermost position.

2. A bevel recessing reamer, comprising, in

combination, an elongated body having an axially extending shank at oneend, the other end having an inwardly extending axial opening comprisingtwo sections of different diameter, the one of larger diameter beingadjacent said other end, the wall of the smaller opening having athreaded section extending inwardly from the juncture of said twosections, a plug comprising two sections of difierent diameters, thesmaller section being threaded and in engagement with the threadedsection of the opening wall, that portion of the plug of larger diameterbeing positioned in the enlarged outer end of the axial opening, theplug having an axial opening, the larger end of the plug having aplurality of longitudinally extending radial grooves terminating attheir inner ends in transverse notches, a cutter blade positioned ineach longitudinal groove, the inner ends of the blade having laterallyextending trunnions engaging in the transverse notches for outwardspreading pivotation, means latching the plug and tubular bodyagainstrelative rotary movement, an outwardly flaring spreader cone having 'anaxial rod-like extension extending through REFERENCES CITED Thefollowing references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 599,655 Huben Feb. 22, 1898762,458 Willard June 14, 1904 833,240 Potter Oct. 16, 1906 Seal Sept.10, 1940

